Sponges and Cnidarian Review

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2 Sponges Which Phylum do Sponges belong to? What does Porifera mean?Pore-bearingFor many years sponges were classed as plants. Why?

3 Sponges Why are Sponges now classified as animals?They do not produce their own food!Do sponges have tissues or organs?NO!Which type of symmetry do they have?Radial

4 Sponges How do sponges get their food?Extract it from water as it flows through the spongeWhat are the openings known as that the water can flow through?PoresWhich cells use their tails to remove food from the water?Collar cells

5 SpongesWhat is the name for the large opening at the top of the sponge where the waste and new sponges exit?Osculum

7 Sponges What gives the sponge support? How do they reproduce?Spicules or the spikesHow do they reproduce?Sexual reproductionAsexual reproductionDo their “young” stay next to them?No

8 Sponges What is the advantage of having their young swim away? Facts!They will not be competing for resources with themFacts!Sponges are sessile – fused to the groundLarval stage is free swimmingRadial symmetry helps them detect things all around themselves

10 Cnidarians Includes jellyfish, coral, and sea anemonesHow do they move?Slow swimming or don’t move at allDo they chase their prey?No, they move slowly they eat what they “bump” into

11 Cnidarians What do their use to kill or stun their prey?CnidariansWhat do their use to kill or stun their prey?Stinging cellsCnidocytes – cell nameNematocysts – harpoon like structure that they fire once to stun the prey

16 Cnidarians What are the two body types that they can have?CnidariansWhat are the two body types that they can have?Polyp (sessile) AsexualMedusa (swimming or free-floating)Sexual

17 Cnidarians What type of symmetry do they have?RadialThey have a nerve net which they use to detect and sense what is around themWhere does the undigested food go?Back through their mouth because they have only 1 opening.